Reamer



I Nov. 4, 1930. w. M. MCBRIDE I REAMEF.

2, 1927 4 2 Sheets-Sheet l Nov. 4, 1930- M. MCBRIDE REAMER Filed July 2, 1927 g Shets-Sheet 2 gmntox McBrizle Patented Nov. 4, 1 930 WILLIARD M. MCBRIDE, OF PITTSBURGH, PENNSYLVANIA v REAMER Application filed July 2, 1927. Serial No. 203,137.

This invention relates to boring tools and more particularly tosuch as are designed to enlarge openings for truing, or to receive oversize or larger parts. 7

5 The invention provides a reamer which is adjustable in diameter within certain limits and which is free from external projecting 7 parts and rigid and durable, the blades being readily removable for replacement and firmly secured to the required adjusted position against possible displacement.

While the drawingsillustrate a preferred embodiment of the invention, it is to be understood that in adapting the means to meet specific needs and requirements, the design may be varied and changes in the minor details of construction may be resorted tolwithin the scope of the invention as claimed, without departing from the spirit thereof.

and the merits thereof, reference is to be had to the following description and the drawings hereto attached, in which,-

Figure 1 is a side View of areamer, embodying the invention.

Figure 2 is a central, longitudinal, sectional view of the reamer, the adjusting bar being in full lines.

Figure 3 is a View similar to Figure 1, the blades being omitted. l

Figure 4 is a detail perspective view of an end portion of the adjusting bar.

Figure 5 is a detail sectional view on the line 55 of Figure 1.

Figure 6 is a detail sectional view on the line 66 of Figure 1.

Corresponding and like parts are referred to in the following description and desig nated in the several views of the drawings by like reference characters.

The body of the reamer is designated by the numeral 1, and may be of any length and diameter depending upon the size of the tool. An opening 2 is formed axially of the body and extends therein a distance from one end depending upon the length of the tool, and the cutting blades. Longitudinal slots 3 are formed in the sides of the body 1 and open outwardly from the axial bore 2. These slots are disposed equidistantly about the sides of For a full understanding of the invention 7 the body and are of a uniform width and have a radial arrangement. The parts 4 separated by the slots 3 are bracingly connected by bridge portions 5 and 6, which form a part of the body 1, the connecting portion 6 being at the outer end of the body and the connecting portion 5 intermediate the ends of the parts 4. The length and the number of the slots 3 will depend upon the size and particular work for which the tool is designed.

A blade 7 is provided for each of the slots 3 and is of a size to snugly fit the slots. The back portion of each of the blades 7 is notched to receive the connecting portions 5 and 6, as shownin Fig. 2. The outer or cutting portion of the blade is reduced, as indicated most clearly in Figure 5. The back of the blade is made rounding, as indicated most clearly in Figure 5, so as to offer a minimum resistance to and facilitate the action of the adjusting bar. Screws 8 threaded into openings formed in the vparts 4 serve as means to secure the 10 and 11 are of circular formation corresponding to the diameter of. the opening 2, whereas the intermediate portion is of polygonal formation, the flat sides 11 corresponding in number to the number of the slots 3, so

. that a flat side 11 is had for each of the blades 7. As shown most clearlyin Figure 5 of the drawings, the body 1 is formed with siX slots 3, hence the polygonal portion of the bar 9 is of hexagonal outline. When the pa rts are assembled a fiat side 11* of the adjusting bar comes opposite a slot 3, and the inner end or back of the blade 7 engages a flat side of the bar so that rotation of the bar, either tothe right or to the left, will effect an outward movement of the blades,thereby increasingthe blades 7 in the required adjusted position.

liameter of the tool. Rotation of the adjust ing bar 9 is eiiected by cutting away portions 12 from opposite sides of the end 10, whereby to form a reduced portion 13 having opposite flat sides against which the inner ends of screws Lt engage, said screws being threaded into openings formed in opposite sides of the body 1. When both screws lt eng 'ge opposite sides of the reduced portion 13 the a djusting bar 9 is heid in fixed position and by backing one of the screws 1%: and advancingthe other screw, the adjusting bar will be turned to cause the flat sides 11 to ride upon the inner ends or backs of the blades 7 and move said blades outwardly. Preliminary to outward adjustment of the blades 7 the fas toning screws 8 are bacired a distance to admit of the outward movement of the blades. After the blades have been adjusted they are made secure by retightening the screws 8, as will be readily understood.

The tool is free from outwardly projecting parts, and the portions a separated by the slots 3 are bracingly connected by the portions 5 and 6, and in consequence, the tool possesses the rigidity of a soiid reamer, with the advantag-es of being ustable and provided with replaceable and removable blades. Displacement of the adjusting bar is prevented by means of the screws 14 entering the cutaway portions 12.

Adjacent flat sides 11 of the adjusting bar 9 do not intersect and form angles, but are connected by small arcuate portions 11 which obtain a bearing against the inner wall of the bore 2 and thus support the bar 9 at points between each two adjacent fiat sides 11*.

The invention provides an adjustable inserted blade reainer embodying features which may be incorporated in analogous tools containing cutter elements which are adj ustable by means of a rotary member.

By the use ofthese new improvementsa positive accurate adjustment can be made to expand and contract the outside diameter of the inserted blades. Many advantages are at tained by the use of the special rotaryadjusting features herein set forth, which are as follows:

It is not bulky or cumbersome in any way. There are no obstructions on the outside of this reamerto hinder full and complete use of this tool to the same extent that asolid tool. could be used. It is very rigid due to the re inforced bridges across the slots. The rioid- 'ness ofthi's tool is further increased due to the adjusting bar 9 fitting neatly in the hole in the body or shell of the tool. Also the bar adjusting screws 14 serve as lock screws as well as for making the bar rotate when adjusting. This feature of locking the bar firmly makes a large degree of accuracy possible. I

Having thus described the invention I claim 2 A reamer comprising an elongated body having an axial opening and a plurality of longitudinal slots and further provided with alined transverse threaded openings inwardly from the slots leading into opposite sides of the axial opening, blades in the slots, a bar havin end portions of cylindrical formation and "its intermediate portion polygonal, one end portion fitting within the axial opening or the body and having portions cut from its op-posits sides to define transversely alined WILLIARD M. MOBRIDE. -[-L. s.] 

